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So my cousins and i like RPG's and we have been playing Dungeon Squad as well as D&D and we wanted to change it up a little so one of my older cousins and i decided to make a D20 based RPG set in the Fallout universe. I have been making the rules using the games as inspiration as well as another fallout RPG that i found that uses a percentile dice system (My younger cousins don't have the patients for an RPG of its depth) while my cousin has done the formatting and essentially turning the mood of the rules and explanations into Fallout examples and stuff. I will be the DM or "Overseer" for our test games and was wondering what you guys think about the mission i have planned so far. The adventure will introduce the PC's to combat hacking/repair as well as some of the RP elements. However the quest line is very WIP at this point with nothing but a general outline so far.
The vault occupants then draw straws to see who will go out and uncover the pipes however they do not know that it was caused by raiders. So the PC's draw the short straws are given some basic weapons and head out to uncover the intake pipes only to be ambushed by a portion of the raider gang by the pipes (While this is happening the rest of the raiders are currently invading the vault) so they will probably kill the raiders unburry the pipes and head back (On perception they may be able to find out that the landslide was caused by explosives) they will then have to fight their way through the raiders or use diplomacy or some other form of underhanded trickery however during the time that they were outside a majority of the vault has been killed.
When they defeat or drive off the raiders they will be pretty much forced to make their way into the wasteland due to the looting and destruction of the vault. This may be due to the population being destroyed or damage has been done to the reactor during a firefight and the reactor has begun to leak radiation making the vault uninhabitable except for the first few floors or so they may need to go on a long ass quest to find parts to repair it and attempt to resettle the vault.
So tell me what you think how you think i should do this or anything i should change feedback and suggestions would be appreciated. Also if you would like to see the rules let me know and i can upload them.